Event
Formation of planet Earth:
Late Heavy Meteor bombardment begins:
Oldest Rock, Acasta Gneiss:
Late Heavy Meteor bombardment ends:
Oldest Fossilized Evidence of Life:
Atmospheric oxygen becomes abundant:
Burgess Shale fauna appears:
First land plants:
Permian extinction:
First Dinosaurs:
Dinosaur Extinction (excluding birds):
Last common ancestor for humans and chimps:
Anatomically modern humans:
First written word (Cuneiform):
C. Columbus sets sail for the New World:
Years Ago
4.543 Ga
4.1 Ga
4.031 Ga
3.8 Ga
3.456 Ga
2.45 Ga
508 Ma
470 Ma
252 Ma
243-233 Ma
66 Ma
Calendar Date
January 1st
February 4
February 10
February 28
March 27th (near 1st day of Spring)
July 16th
November 19th
November 22nd
December 9th
December 10-11th
Dec 24th
Dec 31st between 4 AM and 11 AM
Dec 31st 11:40 PM
Dec 31st at 35 seconds to midnight
Dec 31st at 3.5 seconds to midnight
Revised for web format from “A Geoscience Guide to the Burgess Shale” by Murray Coppold and Wayne Powell, © The Burgess Shale Geoscience Foundation. To purchase this book, please go to: the Yoho National Park Visitors Centre, Alpine Book Peddlers, Amazon.ca, or Amazon.com.